Machine for forming crimped pipe-elbows.



J. DYMOND. MACHINE FOB. FORMI-NG GRIMPED PIPE BLBOWS.

APPLICATION FILED AUG.28, 1911.

1,020,028, Patented Mar. 12, 1912 SHEETS-SHEET WITNESSES:l [N VEN-TORI A T TORNE Y.

. .J. DYMOND. MACHINE FOB. FORMINGGRIMP'BD PIPE ELBOWS.

` APPLXGA'TION PILEDYAUG. 2a, 1911.

1,020,028, f Patented Mar.12,19125 4 SHEETS-SHEET Z.

y BY" mz my@ J. DY'MOND. MACHINE FOR PORMING GRIMPED PIPE ELBOWS. APPLIATION FILED AUG. ze, 1911.A 1,020,028. g Patented 113112.12112.

4 SHEETS-s111131' s.

WITNESSES f v I'N VENTQR.

i A BYK* M11/# A TTORNE Y.

UNTTED STATES PATENT OFFICE.

'JOHN DYMND, OFTORONTO, ONTARIO, CANADA, ASSIGNOR T0 LOU-IS S. MCMURRAY,

OF TORONTG, CANADA.

)[[IACH'INE FOR FGRMING CRIMPED PIPE-ELBOWS.

Specification of Letters Patent. Patented-D131'. 1 2, 1912.

Y Appueaun sied August 2s, 1911. serial No. 646,312.

d To all whom it may concern:

Be it known that I, JOHN DYMOND, of the city of Toronto, in the Province of Gntario,

i bending 'sheet metal pipes into elbows and my object is to devise a 'machine which is capable 'of simultaneously crimping and bending a length of pipe to form an elbow y `v of any desired angle. .Y

I attain my object by means of a construc- .tion in which a length of pipe is supported 'on a suitable mandrel and fed forward in a step-wise fashion to Abe .acted on by sliding 'in Section. Fig. 8 is a sectional view of part crimpers which at each action impress. a circular crimp in the pipe. A suitable bending segment is clamped tothe end of the pipe and after each crimp is formed pressure is applied thereto to bend the pipe that.

fraction of the total bend represented by unity as a numerator and' the total number of crimps in the length of the pipe as a denominator. M '4 Figure 1. is a side elevation of my improved machine partly in section. Fig. 2 is a plan view of the same. Fig. 3 is an end view 'of the same. Fig. 4 is an enlarged longitudinal section of part of the pipe shifting mechanism. Fig. 5 is a plan view'partly in section of the pipe shifting cam. Fig; 6'is a face view of the same cam. Fig. 7 is a front view of t-he rocking lever of the pipe shift-ing mechanism and connections, partly of the p'ipe bending mechanism. Fig. 9 is a front View of thebending segment and the clamp thereof. 10 is a vside elevation of the 'automatic drive-stopping mechanism. Fig. 11 vis a; rear ,View` of' the same parts.

Fig. 12 is a face view ofthe pipeclamp on the slidinghead. Fig. 13 is a-vertical -lon- Fig.'14 is a..

gitudinal section of the same.

front view of part of the machine showing A a modification of the crimping mechanism.

l Fig. 15 isfan enlarged section on theA line a-.a, in Fig.l 14. Fig. 16 is an enlarged section on the line ZJ-b,in Fig. 14. Fig. 17is a front View of4 a portion of one of the crimpers. Fig. 18'is an edge view of the same part. Fig. 19is a front view of one of the clampsand part of a crimper'in the position they assume when a crimp has just been made.

In the drawings likeligures of reference indicate corresponding parts in the different figures. 1 is the frame of the machine suitably shaped to support the diii'erent parts.' AOn this frame is journaled the driving shaft ,2 provided With theusual fast and looselpulleys 3 and 4r.. This drive shaft by means of .the gearing 5 actuates the counterl shaft- 6- journaled centrally and 'longitudinally l:of

the machine. A clutch 7 of ordinary con-A `A struction forms a -driving connection between the shaft andthe gearing. This' clutch is provided with the usual clutch shifting-mechanism 8. The shaft 6 drives the various part-s of the mechanism as will be hereinafter described after ,the general arrangement. of the machine has been set out.

9 is a mandrel carriedvlongitudinally of the machine its rear end being adjustable in the bracket 10. For the mostpart of its lengtlrthis mandrel is a simpleshaft of comparatively small. diameter, but at its forward end is provided with the head 11 adapted to fit the Vinterior of a length ofstove pipe. This head --is heldin place -b the nut 12, threaded on the end .offthe'shiJ t soithat heads Ofditerent size may be einployed according to the diameter of 'the pipe to be operated on.

" 13 is a sliding head .movable longitudinally of the machine onthe guides 14. This head is provided on its face withI a support 15 adapted to lt Within thev end-'of a length of pipe which. also it will. be noted fits over the mandrel head 1l. The length o fpipe is clampedon the support 1llbyA the :following mechanism. A clamping ring is formed in 'two' halves pivoted at 56 bytheir adjacent ends on the head 13. Their other ends 57 are bent upwardly land are engaged by fthe bent levers 58 fulcrumed on a common vfulcrum 59. Between their n'ppcrrends the AWedgeshaped projection' GO on the handY lever 61 is adapted 'toengage to separate the-ends. This hand lcveris fulcruinedon the frame of the machine and is provided with the usual adjusting mechanism 7G by means of Which it may be held in any desired position to which it is moved.. By`

drawing on this lever to force the projection G0 between the'upper ends of the levers ioo A may be. brought into proper position for the first crimp.

As the essence of the operation is that a stepwise movement of the length of pipe Vshall `be made, I provide the following mech anisml forv thepur-pose. The cam 19 is securedto the counter shaft 6. This cam has a high portion 20 formed thereon. The

front of this high portion, which of course takes the greater part of the wear, is formed of a hardened steel sliding block 21, adjustable by means of av screw 22 working through'a cross-bar 23 secured to the back of the cam. This cam actuates the lever 24 pivotedon the frame of the machine ingermediate its ends and preferably provi ed with a friction roller 25 to 4engagelthe cam 19. The upper end of this'lever carries a spring actuated sliding dog' V2t` .ff.uiapted to engage the ratchet teeth formed on the shifter bar 27 secured to the sliding head 13. This shifter bar is preferably provided on opposite. sides with ratchet teeth of different pitch wherebyv by inverting the bar .the amount of forward shift at each step may be varied to suit the space required between the crimps on the pipe. An adjustable stop 28 is provided with which the lever 24C may contact to limit its backward'movement to the space of one tooth of the shifter bar.

The pipe which, by the mechanism described, is given a stepwise forward 'shift is -crimped by the following mechanism: Slid- A ing in the guides 29 are a pair of crimpers 30, comprising thin steel plates notched to embrace the pipe, as shown, and having thin crimping edges working closely together, as shown particularly in Figs. 1, 2 and 3. These crimpers must operate as closely as possible tothe oint'at which the head V11 supports the pipe and thev mandrel must, therefore, be suitably adjusted to-bring the head-and the crimpers into the proper relationship. The crimpers are operated through the medium of the eccentrics 31 onthe' counter shaft 6. The eccentric rods'rc pivotally connectedwith the `ends of the levers 32 which areQpivoted intermediate their ends on the frame and at their upper ends "are pivotally connected with the crimpers 30: The eccentrics are'sct so that alent to that fraction of the total bend represented byA unity as a numerator and the total number of crimps in the length of the bent portion of the pipe as a denominator. This slight bend after each crimp is formed through the medium of the following mechanism: The bending segment 33 is clamped to the outer'end of the pipe through the medium of the ring 3ft to which it -is secured and .rhich preferably ts within the pipe as shown particularly in Figs. 8 and 9. A ring 35 lits outside the pipe end and the of the set screws 36 screwed through the ring 35. Byimparting an inward and forward push to this quadrant in the direction in which the bend is to take place the slight bend referred to may be imparted to the pipe each time a crimp is formed. For the purpose of moving the quadrant the follow ing mechanism is provided. On the end of :the countershaft 6 is secured the cam projection 37 adapted to engage the anti-friclever'39 pivoted intermediate its ends on the frame of the machine. The upper end of this lever is provided with the pin 40 arranged longitudinally of the machine. With this pin is `engaged the notched link 41 having a universal joint connection with the friction bar 42 which is secured tc the ends of 'the parts of the swinging frame 4.3 pivoted on the front end of the machine to one side ofthe center as shown particularly in Figs. 2 and 3. This friction bar at the pointwhere it engages the segment 33 is provided-with a hardened steel plate 44 to take the wear, which plate is grooved to partly receive theedge of the segment. The pin 40 is provided with the stationary collar 46 and the sliding spring actuated collar 47. Between these two .collars the notched link 41 fits, as shown, (see particularly Figs. 1, 2 'and 8). The parts are thus held in place and the connection between the swinging frame and the lever 89'is of a flexible nature allowing the parts to accommodate. themselves to one another. The operation of these parts is as follows: Whenever the nCain 37 actuates the` lever 39 the y:trame 43 is you ace the' endfof the machine. This irn- This plate engages the edge, of the segment and forces the segment slightlyin toward the end of the machine and slightly toward the right. The pipe being held between thel crimpers the movement of the outer edge ofy the quadrant plate causes aslight bend of lthe pipe to take place the extent of which of course depends Qn the set of the cam 37.

the crimpers operate immediately after thei' The pants are so proportioned that `this stove -pipe has been shifted one tooth of tha., `shifting bar 27. Immediately after leach $5" the pipe is given a slight bend-equiv-` slight bend is that fraction of the total bend represented b tion roller 38 secured to the lower end of the unity as a numerator-"and the total num er of `crimps in the length of.y

pipe is clamped to the' inner ringby means V partsia similar movement to the plate 44.

115. swn inwardlypnd toward the right a5 A i; l'. l.

CTI

Locaties the pipe as a denominator. The pressure on the quadrant plate is timed to take place when the crimpers have been slightly withdrawn from the crimp they have formed. This freesthe crimper at the inner side of the bend so that it does not interfere with the compression of the crimp at the inner side of the bend in the pipe.

While the mechanism may be thrown out of gear by hand when an elbow is iinished l prefer to employ automatic means shown vin Figs. 2 and l0 of the drawings. @n the frame of the machine l pivot a bell crank lever 5l. @ne arm of this hellcrank lever lies against the hand lever' 77 of the clutch shifting mechanism 8, which is'bent to bring,` it to a suitable position (see Figs. l and 2). The other end of the bell crank is adapted to be engaged by the spring actuated latch 53 carried by one of ythe crimpers 30. rlhis latch is normally retracted so that it will not engage the lever 517 but may be forced out into an engaging 'position in the,following manner. A. .lever 62 is suitably fulorunied on the crimper intermediate its ends. he inner end engages `behind the end of the latch 53. rllhis latch,

has a head 63 formed at its inner end which is engaged by the coil spring 64C which engages also the shoulder on the support 65 in which the latch is slidable.y The spring :normally tends to retract the latch to disenit from the lever 51. The other end of.

the lever 62 is engaged by the lower end of the lever 6G fulcrumed intermediate its endsv on the crimper. lts upper end is pivotally connected with the inner end of a shifter o7 slidable in the crimper. The outer end of the shifter has a iinger 68 secured there on by means a set screw 69 whereby the position of the finger may Vbe adjusted. This finger 68 is set iu such a position that when the last bend in the pipe has been formed it will he engaged by the edge of the segment 33. The shifter G7 is thus pushed in and through the train of levers described forces out the latch so that its end lies in. the path of the lever 5l. This occurs .vhile the crimpers are in contactfwith the pipe. As the crimpers move 'outwardly to release the pipe the latch 53 rocks the lever il and throws out the clutch. The coil spring connected to the lever Ell and to a stationary part returns the lever to its nmmal position when the bentlength of pipe is removed and the segment 33 there fore disengaged from the linger 68.` As

the head 13 must now-.be moved back for the insertion of. a fresh length of pipe it is provide the ,following mechanism: A linkportioned that the dog is thrown out at the same time as the clutch. After the elbow is finished and the clutch and feed dog thrown out as described, the link l1 `is thrown back and the frame 43 swung out of the way. The hand lever 6l is thrown up to release the finished pipe from the sliding head i3, The finished elbow may then be withdrawn and the new length of pipe inserted. The segment 33 is then clamped to the new length of pipe and the apparatus is in position for the commencement of a new series of crimping and bending operations.

M- to 1Q illustrate an attachment intended. to prevent the surging of the metal under the lateral push of the crimpers which tended to produce disguring ripples in the sides of the elbow. For this purpose I provide what may' be termed clamps 78 arranged diametrically opposite one another alcove and below the elbov;r at the point of crimping. Each clamp is arranged to em- 05 brace the adjacent edges of the crimpers 30 and has its face formed on an arc of a circle so that when a crimp is being formed, it will iit closely tothe surface of the elbow at each side of the crimp. These clam s are vertically movable, each being` pivote on a stein 79 movable in a slot in the frame of the machine. A coil spring 80 is tted on each stem between the frame and a collar 8l. and tends to withdraw the clamp from 165 its operative position. Y

ln order to draw the clamps into engage nient with the elbow as the crimpers advance, 'fc-rrn at each side of each clamp a beveled face 82. These faces are engaged by the 13.0 beveled faces 83 of pieces 84: `:termed on or secured. to the crimpers 30. The' parts are so proportioned that the clamps move approximately one quarter of the travel of the crimpers. f The pivoting` ofthe clamps on the stems 79 permitsl of the clamps being brought down :in close contact with the elbow without any side' strain on the stems.

Nh-at l claim as myvnvention is i. In a pipe crimping and bending niachine the combination of a pipe'mandrel; means for shifting a length of pipe endwise on said mandrel with 'a stepwise movement; crimping1 mechanism acting adjacent the end of the mandrel; means for actuating said crimping mechanism after each forward shift of the pipe.; a single bending segment clamped to the end of the pipe and projecting in front thereof; a swinging frame pivoted vertically 'on the frame of the 1S@ tti Inechine at the front thereof and et one side; a vertical friction/bar carried thereby adapted to engage the bending' segment nearly tangentially; and ineens tor movingv said freine to conse the friction har to strilre the segment. end slightly bend rthe pipe.

2. In e. pipe crimping end bending inw chine .the combination ot a pipe inendrel; menne for shitting a length of pipe endwise von said mendnel with a etepwise movement;

crimping mechanism acting adj ecent the end of the mandrel; means :For actnnting seid crimping mechanism oft-er' each forwercl shift ofthe pipe; a single bending segment clamped tothe end of the pipe and projectine; in front thereof; swinging treme pir* .slightly hencl the pipe.

3. lna .pipe crimping and bending noa chine the combination oi: a 'n 3e mandrel 'l ineens tor ehliftingf a lengtli oit" pipe endwise on said mandrel with stepwise movement; crimping mechanism octingadjaccnt the end of the mandrel; means for actuatingr said crimping* :rnechnnisinafter each forward shift ot the pipe; :i bending segment clamped to the end of the pipe; a swinging 'traine pivoted on the frame of the machine; a friction bar carried thereby adapted to engage the bending; segment.; Ineens for mov ing said traino to canse the friction bar to strike the segment ond slightly bend the pipe iconiprisinc;r e, lever having a. flexible connection with the swinging fren e, and a intnrjv cano adopted to engoge and roch the said lever.

et. In e. pipe cril'npiine,` and bending ina chine the combination ot means for hoiding alcngth oit" pipe; ineens for producing series ot' criinps therein; means 'for slightly bending seid pipe eitcr the production oit coch crimp comprising' n single hendinpr seg;- nient clamped. to the end ot the pipe ond projectingu in front thereof; a swinging ironie pivolctl 'vertically on the vFrance oif the mnchine at the `trent thereof and at 'one side; a vertical friction bar carried. ther-eb)7 adapted to icngege the bendiiig-"-seginent nearly tangcntially; and means for ino-ving said traine to canso the friction har to strike the segment und slightly bend the pipe;

5. Bending mechanism for pipes ctnmnising e. segment ada. ted to be ciampi-ad to a pipe end; a swinging; freinepwoted on the frame oit 'the machine; a :friction bei' carried thereby. adopted tof engage the segv nient; n leverpiofotetlV on the treme ,oit the machine; a cam adapted to roch the lever;

.link engages the pini nominee y a pin on the lever; a nbbched Vlinlt e; lapteritV to engage the pin; and e universal joint con-- nection between lthe link and the frictionv bar.

6; Bending mechanisinlfor pi es cei'nprisF ing a.segment'adopted` te be c 'ahmed toa pipeend; 'a swinging framepivoted 'on the frame of the machine.; a frictionbarl carl* ried thereby adapted to engagethesegment;

e lever pivoted on the fra-me of the machine; 75

a cam adapted to rock the lever; api-ngen the teA lever; a notched link adapted to engagethe I pin; a universal joint connection`- between the link and the friction bar; a. fined collarI l on. the pin; and a movable spring-actuated collar' on the pin., between which collars the 7. Bending mechanism for pi esfcornpris" ing a segment adapted'to bec amped to' a pipe end; a swinging treme pivoted on the" frame of the machine; a friction bar car ried thereby adeptedto engage the segment;`

a lever pivoted on the frame of the machine; 'l v a cem adapted to rock the lever; a, pin Lon.

the levema notched-link adapted to'engagev the pin; a universal joint connection be-` tween the link end the friction bar; end a` shoulder on the friction ber adapted'to cngege beneath the segment.

El. lin a pipe crimping and bending me. chine the combination of a pipe Inondrel; means for shifting a length of pipe endwise on seid mandrel with a stepwise movement; crimping mechanism acting adjacent the end of the mandrel; means for actuating said crimping inectmnism after each fory Ward shift of the pipe; meansvacting on the outer end of the pipe for. slightlybencling .sa-id pipe each time a crimp is formed; drin ing means including a clutch ;and automatic ineens controlled by the movement of the` tree end of the pipe for throwing1 the lest clutch ont of gear subsequent to the "last bendhingr movement. A'

9. l'n e pipe crimping and bending machine the combination of e pipe mandrel; means :torl shifting a length of pipe end.n Wise on seid mandrel with o stelgnn'iseu nnnfen nient; crimping' mechanism noting adjacent `thee-ncl of the mandrel; means for actuating saiol crimping mechanism after eech forward shift .of the pipe; means acting on the onter end ot the pipe for slightigmbending said. pipe earch time a crimp is formed; including a segment clamped to the end of the pipe; automatic Ineens controlleduby the cont-act therewith of said segment for throw ingF the clutch out of gear subsequent to the last bending movement.

10. in a pipo crimping sind bending machine the combination oi a pipe mandrel; means for shifting a length ot' pipe endwise on said mandrel with a stepwise movement; crimping mechanism acting adjacent the ice.

ice

said crimping mechanism after each forward shift ot' the pipe; means acting on the outer end of the pipe for slightly bending said pipe each time a crimp is formed including a segment clamped to theI end of the pipe;

automatic means; normallyT inoperative, but operable .by the crimping mechanism for throwing out the clutch; and means actuated bythe bending segment after the last bending movement for conditioning said clutch shifting means .for operation.

1l. In a pipe crimping and bending machinethe combination of a pipe mandrel; means for shifting a length of pipe endwise on said mandrel with a stepwise movement; crimping mechanism acting adjacent the end of the mandrel; means for actuating said crimping mechanism after each forward shift of the pipe; 'means acting` on the outer end of the pipe for slightly bending said pipe each time a crimp is formed; automatic means; normally inoperative, but operable by the crimping mechanism for throwing out the clutch; and means actuated by the last bendingmovement of the outer end of the pipe for conditioning said clutch shifting means for operation.

12. In a pipe crimping and bending machine the combination of a pipe mandrel; a toothed shifter bar adapted to shift a length of pipe cndvvise on the mandrel; a ratchet dog normally engaging,` said shifter bar and movable to impart a stepwise movenientthereto; crimping mechanism acting adjacent the end of the mandrel; means for actuating said crimping mechanism after each forward'shift of the pipe; means for slightly bending the pipe each time a crimp is formed; and means controlled `by the movement of the free end of the pipe for automatically withdrawing the dog from en- 'lgement with the shifter bar subsequent to the last bend in the pipe.

13. ln a" pipe crimping and bending machine the combination of a pipe mandrel; a toothed shifter bar adapted to shift a length ofpipe endwise on the mandrel; a ratchet dog normally engaging said shifter bar and movable to impart -a stepwise. movement thereto; crimping mechanism acting adjacent the end of the mandrel; means for aetnating said crimping mechanism after each forward shift of the pipe; means for sligl'itly bending the pipe each time a. crimp is formed.; driving means including a clutch; and means controlled by the movement of the free end of the pipe for automatically throwing the clutch out of gear and With- .draiving the dog from engagement with the shifter bar subsequent to the last bend in the pipe.

li. Pipe crimping mechanism -comprising` a pair of opposed slidable platesl notched to embrace the pipe; and a pair of opposed clamps arranged to slide in a'direction at rightl angles to the'direction of movement of the said plates; embracingithe sides of the same and having curved faces adapted to engage the pipe at each side of a crimp being formed.

l5. Pipe crimping mechanism comprising a pair of opposed slidable plates notched to embrace the pipe; a pair of opposed clamps arranged to slide in a direction at right angles to the direction of movement of the said plates, embracing the sides of the same and having curvedl faces adapted to engage the pipe at each side of a. crimp being formed; beveled faces formed on the clamps;

and beveled faces formed on the crimpersadapted to engage the faces on the clamps and press the clamps inwardly when the erimpers are advanced to form a crimp.

16. Pipel crimping mechanism comprising a pair of opposed slidable plates notched to embrace the pipe: a pair of opposed clamps arranged to slide in a direction at right angles to the direction of movement of the said plates, embracing the sides of the same and having curved faces adapted to engage the pipe at each side; of a crimp being formed; stems carrying said clamps and slidablein the frame of the machine; springs engaging the frame and the stems tending to retract the clamps; beveled faces formed on the clamps; and beveled faces formed on the crin'ipers adapted to engage the faces on the clamps and press the clamps inwardly when the Crimpers are advanced to form a crimp.

Toronto, Ont., this 93rd day of'AilglQll.

J Ollhl i' DYMOND.

vSigned in the presence of-n J. How. Marsan, D. S. Tovnnn. 

